Connection - Represents an organisation as it appears in the /connections endpoint.

Contact - Necessary for reading contact information out of the invoice information.

Invoice - As represented in the API.

InvoiceResponse - The object that comes back from the API when we query for invoices.

Organisation - As it is received from the API.

OrganisationAddress - Addresses associated with an organisation.

OrganisationPhone - Phone numbers associated with an organisation.

OrganisationResponse - The response from the /organisation endpoint.

Response is a generic top-level set of properties that we get from every resource endpoint.